no.digipost

Class DiggOptionals

java.lang.Object

no.digipost.DiggOptionals

public final class DiggOptionals
extends Object

Utilities for working with Optionals.

Constructor Summary

Constructors

Constructor and Description
DiggOptionals()

Method Summary

Modifier and Type	Method and Description
static <T,A,R> R	collect(Optional<T> optional, Collector<T,A,R> collector) Unwrap an Optional into another container using a Collector.
static <T> List<T>	toList(Optional<T> optional) Unwrap an Optional into a zero or one element unmodifiable list.
static <T> Stream<T>	toStream(Optional<T>... optionals) Convert Optionals to a Stream consisting of only the present optionals.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DiggOptionals

public DiggOptionals()

Method Detail

toStream

@SafeVarargs
public static <T> Stream<T> toStream(Optional<T>... optionals)

Convert Optionals to a Stream consisting of only the present optionals.

Type Parameters:

T - The type of the given Optionals and returned Stream.

Parameters:

optionals - The Optionals to convert to a Stream.

Returns:

a Stream containing the present Optionals

toList

public static <T> List<T> toList(Optional<T> optional)

Unwrap an Optional into a zero or one element unmodifiable list.

Type Parameters:

T - The type of the optional value.

Parameters:

optional - The optional value to be wrapped in a list.

Returns:

list containing either exactly one or zero elements depending of the Optional being present or not.

collect

public static <T,A,R> R collect(Optional<T> optional,
                                Collector<T,A,R> collector)

Unwrap an Optional into another container using a Collector.

Type Parameters:

T - The type of the optional value.

R - The resulting container type.

Parameters:

optional - The optional value to be wrapped in another container.

collector - The collector to use for wrapping into another container.

Returns:

The new container with either exactly one or zero elements depending of the Optional being present or not.